But looking at the latest report on the state of online advert sing from the Internet Advertising Bureau, it's clear that if there is a revolution in online ad spend going on, it's still in a very early stage. The money is still where it has always been: search advertising.

The distribution of ad revenue hasn't changed much over the past year. But the overall size of the market is growing rapidly. Q2 online ad revenue was up 13.9 percent over 2009 to $6.19 billion.